Alcubierre used this knowledge to exploit a loophole in the "universal speed limit." In his theory, the ship never goes faster than the speed of light — instead, space in front of the ship is contracted while space behind it is expanded, allowing the ship to travel distances in less time than light would take. The ship itself remains in what Alcubierre termed a "warp bubble" and, within that bubble, never goes faster than the speed of light.

Well, indeed it sounds like something that would cost way too much energy to accomplish at the moment.

However, you do not then factor in the fact that we might find ways to manipulate spacetime, which could greatly lessen the energy needed for such a thing.
Just think of an ordinary light bulb, and then compare that to LED's, or the upcoming LET's.

I'm not saying it'll ever get easy, but remarks like "We'll never have enough energy", to me sound a bit like "Computers will never get smaller than a 3x3x3M room".

Is there actually any Star Trek tech that may actually _not_ work ? Hmm transporter maybe .. anything else?

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One of the things I find truly implausible, and probably never possible, is the way the com system works, without people having implants, or telepathy. They always say something like, "Picard to doctor Crusher", which the receiving person then instantly hears, even the part where Picard has only said, "Picard". How the hell did the "computer" know which person to route the call to before the caller has even mentioned the receiving person? =D

They always say something like, "Picard to doctor Crusher", which the receiving person then instantly hears, even the part where Picard has only said, "Picard". How the hell did the "computer" know which person to route the call to before the caller has even mentioned the receiving person?

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It's called record the message first, scan it, find out who it's intended for, and reply it back on an open channel. Ta-da! Done!